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# Copyright (c) 2011, 2025, Oracle and/or its affiliates.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0,
# as published by the Free Software Foundation.
#
# This program is designed to work with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms,
# as designated in a particular file or component or in included license
# documentation. The authors of MySQL hereby grant you an additional
# permission to link the program and your derivative works with the
# separately licensed software that they have either included with
# the program or referenced in the documentation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License, version 2.0, for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# Usage:
# cmake -DWITH_LIBEVENT="bundled"|"system"
#
# Default is "bundled"
#
# We create an INTERFACE library called libevent_interface,
# and an ALIAS ext::libevent
# It will have the necessary INTERFACE_INCLUDE_DIRECTORIES property,
# so just link with it, no need to do INCLUDE_DIRECTORIES.
# Router needs at least:
SET(MIN_LIBEVENT_VERSION_REQUIRED "2.1")
FUNCTION(WARN_MISSING_SYSTEM_LIBEVENT OUTPUT_WARNING)
IF(NOT LIBEVENT_FOUND AND WITH_LIBEVENT STREQUAL "system")
MESSAGE(WARNING "Cannot find LIBEVENT development libraries. "
"You need to install the required packages:\n"
" Debian/Ubuntu: apt install libevent-dev\n"
" RedHat/Fedora/Oracle Linux: yum install libevent-devel\n"
" SuSE: zypper install libevent-devel\n"
)
SET(${OUTPUT_WARNING} 1 PARENT_SCOPE)
ENDIF()
ENDFUNCTION()
MACRO(RESET_LIBEVENT_VARIABLES)
UNSET(LIBEVENT_CORE)
UNSET(LIBEVENT_CORE CACHE)
UNSET(LIBEVENT_EXTRA)
UNSET(LIBEVENT_EXTRA CACHE)
UNSET(LIBEVENT_INCLUDE_DIRECTORY)
UNSET(LIBEVENT_INCLUDE_DIRECTORY CACHE)
UNSET(LIBEVENT_OPENSSL)
UNSET(LIBEVENT_OPENSSL CACHE)
UNSET(LIBEVENT_PTHREADS)
UNSET(LIBEVENT_PTHREADS CACHE)
UNSET(LIBEVENT_VERSION)
UNSET(LIBEVENT_VERSION CACHE)
ENDMACRO()
FUNCTION(FIND_LIBEVENT_VERSION LIBEVENT_INCLUDE_DIRS)
SET(TEST_SRC
"#include <event.h>
#include <stdio.h>
int main()
{
fprintf(stdout, \"%s\", LIBEVENT_VERSION);
}
"
)
FILE(WRITE
"${CMAKE_BINARY_DIR}/find_libevent_version.c"
"${TEST_SRC}"
)
TRY_RUN(TEST_RUN_RESULT COMPILE_TEST_RESULT
${CMAKE_BINARY_DIR}
"${CMAKE_BINARY_DIR}/find_libevent_version.c"
CMAKE_FLAGS "-DINCLUDE_DIRECTORIES=${LIBEVENT_INCLUDE_DIRS}"
COMPILE_OUTPUT_VARIABLE OUTPUT
RUN_OUTPUT_VARIABLE RUN_OUTPUT
)
# MESSAGE(STATUS "TRY_EVENT TEST_RUN_RESULT is ${TEST_RUN_RESULT}")
# MESSAGE(STATUS "TRY_EVENT COMPILE_TEST_RESULT is ${COMPILE_TEST_RESULT}")
# MESSAGE(STATUS "TRY_EVENT COMPILE_OUTPUT_VARIABLE is ${OUTPUT}")
# MESSAGE(STATUS "TRY_EVENT RUN_OUTPUT_VARIABLE is ${RUN_OUTPUT}")
IF(COMPILE_TEST_RESULT)
SET(LIBEVENT_VERSION_STRING "${RUN_OUTPUT}")
STRING(REGEX REPLACE
"([.-0-9]+).*" "\\1" LIBEVENT_VERSION "${LIBEVENT_VERSION_STRING}")
SET(LIBEVENT_VERSION ${LIBEVENT_VERSION} CACHE INTERNAL "" FORCE)
ELSE()
MESSAGE(WARNING "Could not determine LIBEVENT_VERSION")
ENDIF()
MESSAGE(STATUS "LIBEVENT_VERSION (${WITH_LIBEVENT}) ${LIBEVENT_VERSION}")
MESSAGE(STATUS "LIBEVENT_INCLUDE_DIRS ${LIBEVENT_INCLUDE_DIRS}")
MESSAGE(STATUS "LIBEVENT_LIBRARIES ${LIBEVENT_LIBRARIES}")
ENDFUNCTION(FIND_LIBEVENT_VERSION)
FUNCTION(FIND_SYSTEM_LIBEVENT)
IF (NOT LIBEVENT_INCLUDE_PATH)
SET(LIBEVENT_INCLUDE_PATH /usr/local/include /opt/local/include)
ENDIF()
FIND_PATH(LIBEVENT_INCLUDE_DIRECTORY event.h PATHS ${LIBEVENT_INCLUDE_PATH})
IF (NOT LIBEVENT_LIB_PATHS)
SET(LIBEVENT_LIB_PATHS /usr/local/lib /opt/local/lib)
ENDIF()
FIND_LIBRARY(LIBEVENT_CORE event_core PATHS ${LIBEVENT_LIB_PATHS})
FIND_LIBRARY(LIBEVENT_EXTRA event_extra PATHS ${LIBEVENT_LIB_PATHS})
FIND_LIBRARY(LIBEVENT_PTHREADS event_pthreads PATHS ${LIBEVENT_LIB_PATHS})
## libevent_openssl.so is split out on Linux distros
FIND_LIBRARY(LIBEVENT_OPENSSL event_openssl PATHS ${LIBEVENT_LIB_PATHS})
IF (LIBEVENT_CORE AND LIBEVENT_INCLUDE_DIRECTORY)
SET(LIBEVENT_FOUND TRUE PARENT_SCOPE)
SET(LIBEVENT_LIBRARIES
${LIBEVENT_CORE}
${LIBEVENT_EXTRA}
${LIBEVENT_OPENSSL}
${LIBEVENT_PTHREADS}
)
ADD_LIBRARY(libevent_interface INTERFACE)
TARGET_LINK_LIBRARIES(libevent_interface INTERFACE ${LIBEVENT_LIBRARIES})
SET(LIBEVENT_INCLUDE_DIRS ${LIBEVENT_INCLUDE_DIRECTORY})
IF(NOT LIBEVENT_INCLUDE_DIRECTORY STREQUAL "/usr/include")
TARGET_INCLUDE_DIRECTORIES(libevent_interface SYSTEM INTERFACE
"${LIBEVENT_INCLUDE_DIRECTORY}")
ENDIF()
FIND_LIBEVENT_VERSION("${LIBEVENT_INCLUDE_DIRS}")
ENDIF()
ENDFUNCTION(FIND_SYSTEM_LIBEVENT)
FUNCTION(MYSQL_USE_BUNDLED_LIBEVENT)
SET(LIBEVENT_LIBRARIES event_core event_extra event_openssl)
IF(CMAKE_USE_PTHREADS_INIT)
LIST(APPEND LIBEVENT_LIBRARIES event_pthreads)
ENDIF(CMAKE_USE_PTHREADS_INIT)
SET(LIBEVENT_BUNDLE_PATH "extra/libevent/libevent-2.1.11-stable")
SET(LIBEVENT_INCLUDE_DIRS
"${CMAKE_SOURCE_DIR}/${LIBEVENT_BUNDLE_PATH}/include"
"${CMAKE_BINARY_DIR}/${LIBEVENT_BUNDLE_PATH}/include")
SET(LIBEVENT_FOUND TRUE PARENT_SCOPE)
ADD_SUBDIRECTORY(${LIBEVENT_BUNDLE_PATH})
ADD_LIBRARY(libevent_interface INTERFACE)
TARGET_LINK_LIBRARIES(libevent_interface INTERFACE ${LIBEVENT_LIBRARIES})
TARGET_INCLUDE_DIRECTORIES(libevent_interface SYSTEM BEFORE INTERFACE
${LIBEVENT_INCLUDE_DIRS})
FIND_LIBEVENT_VERSION("${LIBEVENT_INCLUDE_DIRS}")
ENDFUNCTION(MYSQL_USE_BUNDLED_LIBEVENT)
MACRO (MYSQL_CHECK_LIBEVENT)
IF (NOT WITH_LIBEVENT)
SET(WITH_LIBEVENT "bundled"
CACHE STRING "By default use bundled libevent.")
ENDIF()
IF(WITH_LIBEVENT STREQUAL "bundled")
MYSQL_USE_BUNDLED_LIBEVENT()
ELSEIF(WITH_LIBEVENT STREQUAL "system")
FIND_SYSTEM_LIBEVENT()
IF(NOT LIBEVENT_FOUND)
RESET_LIBEVENT_VARIABLES()
ENDIF()
ELSE()
MESSAGE(FATAL_ERROR "WITH_LIBEVENT must be bundled or system")
ENDIF()
IF(LIBEVENT_FOUND)
IF(LIBEVENT_VERSION VERSION_LESS MIN_LIBEVENT_VERSION_REQUIRED)
MESSAGE(FATAL_ERROR
"LIBEVENT version must be at least ${MIN_LIBEVENT_VERSION_REQUIRED}, "
"found ${LIBEVENT_VERSION}.\nPlease use -DWITH_LIBEVENT=bundled")
ENDIF()
SET(HAVE_LIBEVENT2 1)
SET(HAVE_LIBEVENT2 1 CACHE BOOL "")
ADD_LIBRARY(ext::libevent ALIAS libevent_interface)
ENDIF()
ENDMACRO()
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